Question
7. What are two ways you can make an electromagnet stronger? Explain why these changes increase its strength.
8. A mechanic dropped a bolt he needed to repair a car motor. He decided to make a simple electromagnet to try to attract the metal bolt. Which list of material would make the best electromagnet?
a
metal rod for a core, copper wire, 9-volt battery
b
glass rod for a core, copper wire, 9-volt battery
c
plastic rod for a core, copper wire, 9-volt battery
d
wooden rod for a core, copper wire, 9-volt battery
9. How could you increase the electrical force between two charges? (Select all that apply)
a
decrease the distance between the charges
b
decrease the size of the charges
c
increase the distance between the charges
d
increase the size of the charges
8. A mechanic dropped a bolt he needed to repair a car motor. He decided to make a simple electromagnet to try to attract the metal bolt. Which list of material would make the best electromagnet?
a
metal rod for a core, copper wire, 9-volt battery
b
glass rod for a core, copper wire, 9-volt battery
c
plastic rod for a core, copper wire, 9-volt battery
d
wooden rod for a core, copper wire, 9-volt battery
9. How could you increase the electrical force between two charges? (Select all that apply)
a
decrease the distance between the charges
b
decrease the size of the charges
c
increase the distance between the charges
d
increase the size of the charges
Answers
Answered by
GPT-4o mini
**7. Two ways to make an electromagnet stronger:**
1. **Increase the number of wire turns:** By adding more turns of copper wire around the core, you can increase the strength of the magnetic field produced. This is because each loop of wire contributes to the total magnetic field; more loops result in a stronger cumulative magnetic field around the core.
2. **Use a ferromagnetic core:** Replacing an air core with a ferromagnetic material (such as iron) significantly enhances the strength of the electromagnet. Ferromagnetic materials have high magnetic permeability, meaning they can enhance the magnetic field produced by the current-carrying wire. This is due to the alignment of magnetic domains in the material, which adds to the overall magnetic field.
**8. Which list of materials would make the best electromagnet?**
The best choice is:
- **a**: metal rod for a core, copper wire, 9-volt battery.
A metal rod (especially a ferromagnetic one) will enhance the magnetic field produced by the copper wire when current flows through it, making it a more effective electromagnet compared to other materials like glass, plastic, or wood.
**9. How could you increase the electrical force between two charges? (Select all that apply)**
- **a**: decrease the distance between the charges
- **d**: increase the size of the charges
Decreasing the distance between charges increases the electrical force according to Coulomb's law, which states that force is inversely proportional to the square of the distance between the charges. Increasing the size of the charges increases the electrical force since the force is directly proportional to the product of the magnitudes of the charges. Options b and c would not increase the force between the charges.
1. **Increase the number of wire turns:** By adding more turns of copper wire around the core, you can increase the strength of the magnetic field produced. This is because each loop of wire contributes to the total magnetic field; more loops result in a stronger cumulative magnetic field around the core.
2. **Use a ferromagnetic core:** Replacing an air core with a ferromagnetic material (such as iron) significantly enhances the strength of the electromagnet. Ferromagnetic materials have high magnetic permeability, meaning they can enhance the magnetic field produced by the current-carrying wire. This is due to the alignment of magnetic domains in the material, which adds to the overall magnetic field.
**8. Which list of materials would make the best electromagnet?**
The best choice is:
- **a**: metal rod for a core, copper wire, 9-volt battery.
A metal rod (especially a ferromagnetic one) will enhance the magnetic field produced by the copper wire when current flows through it, making it a more effective electromagnet compared to other materials like glass, plastic, or wood.
**9. How could you increase the electrical force between two charges? (Select all that apply)**
- **a**: decrease the distance between the charges
- **d**: increase the size of the charges
Decreasing the distance between charges increases the electrical force according to Coulomb's law, which states that force is inversely proportional to the square of the distance between the charges. Increasing the size of the charges increases the electrical force since the force is directly proportional to the product of the magnitudes of the charges. Options b and c would not increase the force between the charges.
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